Question about 1990 Chevrolet C1500

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90 chevy 1/2 heater.power at power at switch,resistor or motor.

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Posted on Jan 02, 2017

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SOURCE: no power to headlight on 90 3500 chevy switch ok

there is no fuse for the headlights, there is a built in circuit breaker in the main headlight switch, it gets power directly from the ignition switch

Posted on Mar 11, 2009

  • 401 Answers

SOURCE: I have a 98 chev

Hi check the connector at the resistor for for corrosion
if the terminials are GREEN that is corroision and wii cause high resistance which causes heat

Posted on May 09, 2009

  • 81 Answers

SOURCE: Blower motor or resistor?

I had a truck about the same year with the same problem, it was the wiring harness, but id check the resistor and the fan first before replacing anythings,

Posted on May 20, 2009

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SOURCE: Changing a blower motor resistor

There is two screws holding it in,unplug the resister,and remove the screws,pull it out,

Posted on Nov 08, 2009

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SOURCE: The blower motor on my 2005 Chevy Trailblazer is

try checking for a 12v feed to the motor and iam sure you will find one ,i think the problem is the earth as the earth is the one that controls the speed via the reostat and the control knob ,so if its works with an earth then its either the reostat or the control switch

Posted on Jun 12, 2010

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Have you checked fuses? Did both stop at the same time?

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Chevy astro

2 fuses to check, Kevin: in the instrument panel fuse block, 20 amp fuse #12, Htr-A/C. In the under hood fuse block, Frt HVAC fuse, 30 amp.

The new resistor you put in, was it called a "Blower Motor Resistor and Relay Pack" ? It appears there is a relay there with the resistor, but appears to only be used with htr on high speed. However the low speed wiring is also routed through this relay. If it was the Pack you put in, guess that is not an issue.
In the Heater and A/C Control Module is the blower switch. The power in to the control module is a brown wire (from the #12 fuse in instr. panel). With key on should be hot. It appears the brown wire goes to the mode switch and then to the blower switch. Check for power in, and check continuity of both switches. Or check if blower switch has power to it, then check for continuity in it-it should have continuity in all speeds.
If all is good so far, you need to check if blower motor ground is good.
Here can be found a wiring diagram for your Astro. Look for heater controls under the system called "HVAC". Every wiring diagram and TSB for the Astro (or any make, model) can be found here:
Good luck.

Jan 04, 2014 | Cars & Trucks

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2004 1 ton dual wheel work van Blower motor not working .changed resister.. still nothing checkrd fuses. have 12 volts on red and black wires at resistor.. no other wires at resistor have power even...

The switch doesnt "power the resistor" it GROUNDS it. I dont have a diagram here at home, but how about the wires at the blower motor.If both are hot, theres a bad ground somewhere. Did it act up before it didnt work? So is it a VAN or a truck? 04 or 01?

Sep 01, 2011 | 2001 Chevrolet Silverado 2500HD

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My 2001 chevy 4x4 extended cab heater switch has stoped working on #5 setting, 1 year later it worked on # 4 setting this morning it only works on # 3 setting 2 and 1. Would you please let me know what I...


Jan 10, 2011 | 2001 Chevrolet Silverado 1500

1 Answer

Heater fan won't work

Hope this helps, it it does please leave feedback Thank You and Good Luck

Check fuses
Check power at blower motor
if there is power try to tap the motor this may getting it going but you will need motor.
if no power
check power before resistor
if power present and it goes on/off with blower motor switch
resistor is bad
if no power to resistor check power from fuse to resistor
but most likely it will be either the fuse, resistor or the motor

Jan 01, 2011 | 2000 Chevrolet Blazer

2 Answers

The fan went out on my heater is this a fuse problem? 1999 Chevy Express

It could be:

1. A fuse
2. The fan switch
3. The motor itself

Dec 08, 2009 | 1999 Chevrolet Express

2 Answers

1985 chevy 1/2 ton heater not blowing what would cause this?

check fuse and switch for heater if good check power to blower motor at heater core if power remove blower motor and check housing for debris (leaves etc)and blower motor for proper turning unit may need to be lubed if hard to turn or seized if seized and oil/lube not working replace blower

Oct 31, 2009 | 1985 Chevrolet Chevy

2 Answers

Blower motor or resistor?

I had a truck about the same year with the same problem, it was the wiring harness, but id check the resistor and the fan first before replacing anythings,

May 20, 2009 | 2002 Chevrolet Silverado 1500

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Fan quit on 87 celebrity, heat ac, etc.. fuse ok ????

Check for bad connection at heater resistor or try tapping heater motor lightly
with ignition switch on and heater switch on. Could be heater switch connection.

Apr 01, 2009 | 1987 Chevrolet Celebrity

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